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 EulerPhi

 http://functions.wolfram.com/13.06.29.0014.01

 Input Form

 EulerPhi[n Floor[n/DivisorSigma[0, n]]] <= EulerPhi[n]^2 /; n >= 2

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List[RowBox[List["EulerPhi", "[", RowBox[List["n", " ", RowBox[List["Floor", "[", FractionBox["n", RowBox[List["DivisorSigma", "[", RowBox[List["0", ",", "n"]], "]"]]], "]"]]]], "]"]], "\[LessEqual]", SuperscriptBox[RowBox[List["EulerPhi", "[", "n", "]"]], "2"]]], "/;", RowBox[List["n", "\[GreaterEqual]", "2"]]]]]]

 MathML Form

 ϕ TagBox["\[Phi]", EulerPhi] ( n n σ TagBox["\[Sigma]", DivisorSigma] 0 ( n ) ) ϕ TagBox["\[Phi]", EulerPhi] ( n ) 2 /; n 2 Condition EulerPhi n n DivisorSigma 0 n -1 EulerPhi n 2 n 2 [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List[RowBox[List["EulerPhi", "[", RowBox[List["n", " ", RowBox[List["Floor", "[", FractionBox["n", RowBox[List["DivisorSigma", "[", RowBox[List["0", ",", "n"]], "]"]]], "]"]]]], "]"]], "\[LessEqual]", SuperscriptBox[RowBox[List["EulerPhi", "[", "n", "]"]], "2"]]], "/;", RowBox[List["n", "\[GreaterEqual]", "2"]]]]]]

 Date Added to functions.wolfram.com (modification date)

 2002-12-18